Will Xi Jinping really help the U.S. contain North Korea?

President Trump is reversing some of his foreign-policy positions, but this should be no great surprise and so far the changes are mainly for the better. Mr. Trump is never going to pursue a consistent geopolitical strategy because he doesn’t think that way. As President he is approaching the world as he does everything else—as a transactional deal maker who wants agreements that he can sell as a security or economic success. Exhibit A is his recent engagement with China over North Korea’s nuclear missile program.